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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, is another subzero cold winter month in Harpers Ferry, Iowa, with an average temperature fluctuating between 23.2°F (-4.9°C) and 10.6°F (-11.9°C). In Harpers Ferry, the lowest average temperatures are observed in January, with a high of 23.2°F (-4.9°C) and a low of 10.6°F (-11.9°C). Weather in January »
Weather in February
February, the last month of the winter in Harpers Ferry, is another freezing cold month, with an average temperature fluctuating between 27°F (-2.8°C) and 13.5°F (-10.3°C). As Harpers Ferry welcomes February, the average high-temperature is noted at a still subzero cold 27°F (-2.8°C), closely aligning with the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a cold month in Harpers Ferry, Iowa, with an average temperature fluctuating between 42.1°F (5.6°C) and 26.8°F (-2.9°C). With the onset of March, Harpers Ferry's weather experiences a distinct temperature rise, moving from a subzero cold 27°F (-2.8°C) in February to a wintry 42.1°F (5.6°C). Weather in March »
Weather in April
April in Harpers Ferry, Iowa, is a cool spring month, with an average temperature ranging between max 54.7°F (12.6°C) and min 37.4°F (3°C). In Harpers Ferry, the average high-temperature in April increases from a cold 42.1°F (5.6°C) in March to a fresh 54.7°F (12.6°C). Weather in April »
Weather in May
May, the last month of the spring in Harpers Ferry, is an enjoyable month, with an average temperature varying between 66.6°F (19.2°C) and 48.6°F (9.2°C). May indicates a change in the average high-temperature, moving up from a fresh 54.7°F (12.6°C) in April to a comfortable 66.6°F (19.2°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Harpers Ferry, Iowa, with temperature in the range of an average high of 75.9°F (24.4°C) and an average low of 58.1°F (14.5°C). The transition from May to June brings a temperature rise, with average high-temperatures increasing from a comfortable 66.6°F (19.2°C) to a moderately hot 75.9°F (24.4°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Harpers Ferry, Iowa, with an average temperature varying between 79.9°F (26.6°C) and 61.9°F (16.6°C). Harpers Ferry's temperatures tend to reach their peak averages in July, with a high of 79.9°F (26.6°C) and a low of 61.9°F (16.6°C). Weather in July »
Weather in August
August, the last month of the summer in Harpers Ferry, is another warm month, with an average temperature varying between 59.4°F (15.2°C) and 78.6°F (25.9°C). During August, the average high-temperature is a still moderately hot 78.6°F (25.9°C), maintaining a close resemblance to that of the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also an agreeable month in Harpers Ferry, Iowa, with temperature in the range of an average high of 71.8°F (22.1°C) and an average low of 52.2°F (11.2°C). Transition into September subtly marks a drop in the average high-temperature, moderately moving from a moderately hot 78.6°F (25.9°C) in August to a pleasant 71.8°F (22.1°C). Weather in September »
Weather in October
October, the same as September, in Harpers Ferry, Iowa, is another mild autumn month, with an average temperature varying between 41.5°F (5.3°C) and 57.7°F (14.3°C). October's arrival coincides with a drop in the average high-temperature, decreasing from September's agreeable 71.8°F (22.1°C) to a refreshing 57.7°F (14.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Harpers Ferry, Iowa, with temperature in the range of an average low of 29.7°F (-1.3°C) and an average high of 43°F (6.1°C). November is characterized by a clear drop in the average high-temperature, falling from October's mild 57.7°F (14.3°C) to a chilly 43°F (6.1°C). Weather in November »
Weather in December
December, the first month of the winter in Harpers Ferry, is also a subzero cold month, with an average temperature fluctuating between 19°F (-7.2°C) and 29.8°F (-1.2°C). With December's onset, the weather shows a temperature decrease, transitioning from a frosty 43°F (6.1°C) in November to a freezing cold 29.8°F (-1.2°C). Weather in December »
Updated: Feb 12, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month in Harpers Ferry?
January is Harpers Ferry's coldest month, registering average high temperatures of 23.2°F (-4.9°C) and lows of 10.6°F (-11.9°C).
What are the most humid months in Harpers Ferry?
January and February, with an average relative humidity of 88%, are most humid months in Harpers Ferry, Iowa.
What is the driest month in Harpers Ferry?
January is the month with the least rainfall in Harpers Ferry. Rain falls for 3.8 days and accumulates 0.75" (19mm) of precipitation.
How many days does it rain in Harpers Ferry?
Throughout the year, there are 124.7 rainfall days, and 22.56" (573mm) of precipitation is accumulated.
When does it snow in Harpers Ferry?
Months with snowfall are January through May, October through December.
How much does it snow in Harpers Ferry?
Throughout the year, in Harpers Ferry, Iowa, there are 44.5 snowfall days, and 15.47" (393mm) of snow is accumulated.
What is the month with the least sunshine in Harpers Ferry?
The month with the least sunshine is January, with an average of 3.4h of sunshine.
What are the months with the lowest UV index in Harpers Ferry?
The months with the lowest UV index in Harpers Ferry, Iowa, are January, November and December, with an average maximum UV index of 1.
When does it snow the most in Harpers Ferry?
The month with the most snowfall in Harpers Ferry is February, when snow falls for 9.8 days and typically aggregates up to 3.94" (100mm) of snow.
When is Daylight Saving Time (DST) in Harpers Ferry?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Harpers Ferry, Iowa, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
What is the rainiest month in Harpers Ferry?
The month with the most rainfall in Harpers Ferry is June, when the rain falls for 18.6 days and typically aggregates up to 3.9" (99mm) of precipitation.
When it does not snow in Harpers Ferry?
June through September are months without snowfall.
When are the longest days in Harpers Ferry?
June has the longest days of the year in Harpers Ferry, Iowa, with an average of 15h and 18min of daylight.
What is the month with the highest UV index in Harpers Ferry?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What is the warmest month in Harpers Ferry?
July is the warmest month, with the temperature often reaching an average high of 79.9°F (26.6°C) and an average low of 61.9°F (16.6°C).
What month has the most sunshine in Harpers Ferry?
The month with the most sunshine is August, with an average of 9.8h of sunshine.
What is the least humid month in Harpers Ferry?
With an average relative humidity of 76%, October is the least humid month in Harpers Ferry, Iowa.
What is the month with the shortest days in Harpers Ferry?
With an average of 9h and 0min of daylight, December has the shortest days of the year.
Average temperature
Harpers Ferry, IA
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (23.2°F).
The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (10.6°F).
Average pressure
Harpers Ferry, IA
- Average pressure in January:
30.13"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.96"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
29.99"Hg - Average pressure in November:
30.08"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Harpers Ferry, IA
- Average wind speed in January:
9.4mph - Average wind speed in February:
9.3mph - Average wind speed in March:
9.3mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.5mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.5mph - Average wind speed in October:
8.8mph - Average wind speed in November:
9.4mph - Average wind speed in December:
9.1mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity
Harpers Ferry, IA
The months with the highest relative humidity are January and February (88%).
The month with the lowest relative humidity is October (76%).
Average rainfall
Harpers Ferry, IA
- Average rainfall in January:
0.75" - Average rainfall in February:
0.91" - Average rainfall in March:
1.3" - Average rainfall in April:
2.32" - Average rainfall in May:
3.19" - Average rainfall in June:
3.9"
- Average rainfall in July:
2.48" - Average rainfall in August:
1.77" - Average rainfall in September:
1.97" - Average rainfall in October:
1.81" - Average rainfall in November:
1.1" - Average rainfall in December:
1.06"
The wettest month (with the highest rainfall) is June (3.9").
The driest month (with the least rainfall) is January (0.75").
Average rainfall days
Harpers Ferry, IA
- Average rainfall days in January:
3.8 days - Average rainfall days in February:
3.6 days - Average rainfall days in March:
9.6 days - Average rainfall days in April:
13.9 days - Average rainfall days in May:
18.1 days - Average rainfall days in June:
18.6 days
- Average rainfall days in July:
13.8 days - Average rainfall days in August:
11.8 days - Average rainfall days in September:
10.8 days - Average rainfall days in October:
9.5 days - Average rainfall days in November:
6.5 days - Average rainfall days in December:
4.7 days
The month with the highest number of rainy days is June (18.6 days).
The month with the least rainy days is February (3.6 days).
Average snowfall
Harpers Ferry, IA
The month with the highest snowfall is February (3.94").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Harpers Ferry, IA
- Average snowfall days in January:
11.7 days - Average snowfall days in February:
9.8 days - Average snowfall days in March:
6.7 days - Average snowfall days in April:
1.8 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
1.1 days - Average snowfall days in November:
3.5 days - Average snowfall days in December:
9.8 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Harpers Ferry, IA
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 4min - Average daylight in December:
9h and 0min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in January:
3h and 2min - Average sunshine in February:
3h and 4min - Average sunshine in March:
5h and 5min - Average sunshine in April:
7h and 1min - Average sunshine in May:
8h and 1min - Average sunshine in June:
9h and 1min
- Average sunshine in July:
9h and 4min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 2min - Average sunshine in November:
5h and 0min - Average sunshine in December:
3h and 5min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days
Harpers Ferry, IA
- Average sunshine days in January:
17.5 days - Average sunshine days in February:
16.1 days - Average sunshine days in March:
16 days - Average sunshine days in April:
13.7 days - Average sunshine days in May:
11.1 days - Average sunshine days in June:
9.6 days
- Average sunshine days in July:
13.3 days - Average sunshine days in August:
16.7 days - Average sunshine days in September:
17.5 days - Average sunshine days in October:
19 days - Average sunshine days in November:
19.4 days - Average sunshine days in December:
17.6 days
The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is June (9.6 days).
Average UV index
Harpers Ferry, IA
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover
Harpers Ferry, IA
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility
Harpers Ferry, IA
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Harpers Ferry, Iowa, USA
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